From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Courtier-Dutton <James@superbug.demon.co.uk>
Subject: [PATCH] Full duplex dmix,dsnoop
Date: Thu, 25 Mar 2004 19:37:22 +0000
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See attached patch for suggested new pcm device.

It works for: -
arecord -fdat -Dplug:duplex | aplay -Dplug:duplex

bash-2.05b# arecord -fdat -Dplug:duplex | aplay -Dplug:duplex
Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

but fails for: -
arecord -fcd -Dplug:duplex | aplay -Dplug:duplex

bash-2.05b# arecord -fcd -Dplug:duplex | aplay -Dplug:duplex
Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
arecord: pcm.c:5920: snd_pcm_mmap_commit: Assertion `frames <= 
snd_pcm_mmap_avail(pcm)' failed.
Aborted by signal Aborted...

This last example with -fcd, outputs one period, maybe two then exits 
with the above error.

Can anybody help?

Cheers
James

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--- alsa.conf.org	2004-02-04 12:28:31.000000000 +0000
+++ alsa.conf	2004-03-25 19:27:34.207640104 +0000
@@ -228,6 +228,12 @@
 	}
 }
 
+pcm.duplex {
+	type asym
+		playback.pcm "dmix"
+		capture.pcm "dsnoop"
+}
+
 pcm.shm {
 	@args [ SOCKET PCM ]
 	@args.SOCKET {

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